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Questions of stellar evolution relevant to high energy astrophysics
(Transparencies without blackboard notes)
16.11.2010
Nucleosynthesis: During the life-time of a star, fusion processes produce more and more heavy elements – an onion-skin strukture evolves.
No further fusion beyond Fe !→ no counter-pressure against gravitation→ core collapses until a new equilibrium is reached
Rayleigh-Taylor instability: Light fluid pushes heavy fluid – both fluids seek potential minimum: Interpenetration, turbulences (Rayleigh 1883, Taylor 1950)
Rayleigh-Taylor fingers observed in the Crab Nebula
FLASH code simulationU.Chicago